L5973D STMicroelectronics, L5973D Datasheet - Page 9

• Manufacturer Part Number: L5973D
• Description: IC REG SWITCHING STEPDOWN SOIC-8
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L5973D

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 1.24 ~ 35 V
• Current - Output: 2.5A
• Frequency - Switching: 250kHz
• Voltage - Input: 4 ~ 36 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
• Power - Output: 2.25W
• Output Voltage: 35 V
• Output Current: 2.5 A
• Input Voltage: 4 V to 36 V
• Switching Frequency: 212 KHz to 280 KHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Duty Cycle (max): 100 %
• Current, Input Bias: 2.5 μA
• Current, Output: 300 μA
• Current, Supply: 2.5 mA
• Frequency, Oscillator: 250 kHz
• Package Type: HSOP-8
• Power Dissipation: 2.25 W
• Regulation, Line: 5 mV
• Regulation, Load: 8 mV
• Regulator Type: Low Dropout, Switching
• Temperature, Operating, Range: -40 to +150 °C
• Transconductance: 2.3
• Voltage, Gain: 57 dB
• Voltage, Input: 36 V
• Voltage, Output: 35 V
• Voltage, Output, High: 3.5 V
• Voltage, Output, Low: 0.4 V
• Voltage, Supply: 12 V
• No. Of Pins: 8
• Rohs Compliant: Yes
• Primary Input Voltage: 36V
• No. Of Outputs: 1
• Switching Frequency Max: 250kHz
• Supply Voltage Max: 36V
• Low Dropout Operation: 100 % duty cycle
• For Use With: 497-4134 - EVAL BOARD FOR L5973 SERIES497-4133 - EVAL BOARD FOR L5973 SERIES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L5973D
5
Application circuit
In figure 6 is shown the demonstration board application circuit, where the input supply
voltage, V
the output voltage is adjustable from 1.235 V to V
Figure 12. Demonstration board application circuit
Table 5.
CERAMIC
Reference
VIN = 4.4V to 25V
10µF
25V
C1
C1
C2
C3
C4
R1
R2
R3
D1
L1
CC
, can range from 4 V to 25 V due to the rated voltage of the input capacitor and
Component list
220pF
3.3V
22nF
GRM32DR61E106KA12L
C4
C3
POSCAP 6TPB330M
C1206C223K5RAC
C1206C221J5GAC
SYNC.
COMP
DO3316P-153
VREF
Part number
STPS2L25U
VCC
4.7K
R3
6
8
2
4
INH
L5973D
3
7
5.6 K, 1%, 0.1 W 0603
3.3 K, 1%, 0.1 W 0603
4.7 K, 1%, 0.1 W 0603
GND
CC
220 pF, 5%, 50 V
22 nF, 10%, 50 V
D03IN1440
1
5
330 µF, 6.3 V
Description
.
10 µF, 25 V
15 µH, 3 A
2 A, 25 V
OUT
FB
STPS2L25U
L1 15µH
D1
Application circuit
5.6K
3.3K
Manufacturer
R1
R2
COILCRAFT
KEMET
KEMET
Neohm
Neohm
Neohm
Murata
Sanyo
VOUT=3.3V
ST
330µF
6.3V
C2
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